Quote:
Originally Posted by thetorch
Do not make the common mistake of covering huge areas with 100% sound dampener (like Dynomat or Damplifier Pro). You only need to do larger flat areas that can vibrate, and 25%-60% coverage is plenty. People cover their entire interior with this stuff, and it just adds unnecessary weight.
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^^^THIS^^^
In all of my years of ripping and tearing apart interiors in high end cars for various repairs behind said panels, I've seen the progression of sound deadening. Modern cars more often than not use a small strip of heavy sound deadening in the middle of larger panels and strategically located smaller strips in certain areas, then combine that with a thinsulate type material on the backside of interior panels, and even then, the thinsulate rarely covers the whole inside of the panel, only strips or patches.
Short of breaking out the engineering crew, test track, dB meter and spectrum analyzer, I'd follow what most of the factories use.